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Lukas Weichselbaum

@webappsec.dev
2.4K followers 673 following 55 posts

Leading Google's web security team. Passionate about web security and making secure-by-default web development the norm. Contributed to web platfom security features like CSP, Fetch Metadata, COOP and Trusted Types.

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Lukas Weichselbaum @webappsec.dev · 09/04/2025
One of my teams at Google, 𝗔𝗜 𝗔𝗴𝗲𝗻𝘁 𝗦𝗲𝗰𝘂𝗿𝗶𝘁𝘆, is expanding in 𝗭𝘂𝗿𝗶𝗰𝗵 🇨🇭and 𝗡𝗲𝘄 𝗬𝗼𝗿𝗸 🇺🇸. We're looking for 𝗦𝗲𝗰𝘂𝗿𝗶𝘁𝘆 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝘀 with experience in attacking and securing AI/ML systems. DMs open.
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Lukas Weichselbaum @webappsec.dev · 18/03/2025
Safari Tech Preview 215: Added support for Trusted Types 🎉 webkit.org/blog/16523/r...
webkit.org
Release Notes for Safari Technology Preview 215
Safari Technology Preview Release 215 is now available for download for macOS Sequoia and macOS Sonoma.
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Michele Spagnuolo @miki.it · 01/03/2025
Excited to present Security Signals with @ddworken.bsky.social and @webappsec.dev, my primary project at Google for the past five years. Thanks, @madwebwork.bsky.social! Paper: research.google/pubs/securit... Slides: speakerdeck.com/mikispag/sec...
research.google
Security Signals: Making Web Security Posture Measurable At Scale
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Lukas Weichselbaum @webappsec.dev · 04/02/2025
Building secure web apps shouldn't be a burden. We've built a high-assurance web framework at Google that makes security easy for developers. Learn about our "Secure by Design" approach and how it works in our new blog post: bughunters.google.com/blog/6644316... cc: @ddworken.bsky.social
bughunters.google.com
Blog: Secure by Design: Google's Blueprint for a High-Assurance Web Framework
Learn more about how Google has created and deployed a high-assurance web framework that almost completely eliminates exploitable web vulnerabilities.
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Lukas Weichselbaum @webappsec.dev · 04/02/2025
Building secure web apps shouldn't be a burden. We've built a high-assurance web framework at Google that makes security easy for developers. Learn about our "Secure by Design" approach and how it works in our new blog post: bughunters.google.com/blog/6644316... cc: @ddworken.bsky.social
bughunters.google.com
Blog: Secure by Design: Google's Blueprint for a High-Assurance Web Framework
Learn more about how Google has created and deployed a high-assurance web framework that almost completely eliminates exploitable web vulnerabilities.
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Lukas Weichselbaum @webappsec.dev · 04/12/2024
The Great Google Password Heist: 15 years of hacking passwords to test our security (and build team culture!) bughunters.google.com/blog/6355265...
bughunters.google.com
Blog: The Great Google Password Heist: 15 years of hacking passwords to test our security (and build team culture!)
The Leaving Tradition in Google's security team, which could be described as a type of small-scale offensive security exercise, is a great (and fun) example of team culture. Curious? See this blog pos...
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Freddy @freddyb.bsky.social · 27/11/2024
Modern solutions against cross-site attacks (frederikbraun.de/modern-solut...): An article about cross-site leak attacks and browser-based defenses. You will also learn why web security best practices is always opt-in and finally how YOU can get increased security controls.
frederikbraun.de
Modern solutions against cross-site attacks
Modern solutions against cross-site attacks
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Lukas Weichselbaum @webappsec.dev · 26/11/2024
Welcome @shhnjk.bsky.social 🎉
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ChiefGyk3D @chiefgyk3d.com · 26/11/2024
This is my #IT, #Infosec, and #Cybersecurity starter pack. There’s plenty of room if some people want to be added too. But here are some feeds and people I recommend following go.bsky.app/QYMa3yN
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Lukas Weichselbaum @webappsec.dev · 26/11/2024
MITRE: Cross-Site Scripting Is 2024's Most Dangerous Software Weakness www.darkreading.com/application-...
darkreading.com
Cross-Site Scripting: 2024's Most Dangerous Software
In addition to XSS, MITRE and CISA's 2024 list of the 25 most dangerous security vulnerability types (CWEs) also flagged out-of-bounds write, SQL injection, CSRF, and path traversal.
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April King @april.social · 21/11/2024
Handling Cookies is a Minefield: Inconsistencies in the HTTP cookie specification and its implementations have caused a situation where countless websites (including Facebook, Netflix, Okta, WhatsApp, Apple, etc.) are one small mistake away from locking their users out. grayduck.mn/2024/11/21/h...
facebook errornetflix errorokta errorwhatsapp error
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Lukas Weichselbaum @webappsec.dev · 22/11/2024
Congratulations, this is amazing! Since you asked, our Google CSP/Reporting API collector currently processes ~3.5B reports per day. That's for CSP, COOP, Trusted Types, and custom reporting. It has enabled us to truly scale up deployment of web platform security features across Google in a safe way
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Koto @kkotowicz.bsky.social · 21/11/2024
@webappsec.dev has go.bsky.app/Uf8dZhz, it's a good one.
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AntSwig @antswig.bsky.social · 18/11/2024
What do you call a padlock for spiders? Web security! ... I'll see myself out...
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Brian Tyler Cohen @briantylercohen.bsky.social · 19/11/2024
It took me twelve years (!) to build up my audience on Twitter. It took 5 days to surpass the 50% point of my Twitter following on Bluesky. I’m hopeful that the overall growth on this site will negate the need to go on Twitter altogether. Sad to see what it devolved into, but thrilled to see it die.
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Jay 🦋 @jay.bsky.team · 19/11/2024
Bluesky now has over 20M people!! 🎉 We've been adding over a million users per day for the last few days. To celebrate, here are 20 fun facts about Bluesky:
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terjanq @terjanq.me · 19/11/2024
Great article about multipart parsing. Reminds me about the bypasses I found in modsec parser medium.com/@terjanq/waf...
medium.com
WAF bypasses via 0days
based on findings from a live hacking event
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Lukas Weichselbaum @webappsec.dev · 18/11/2024
Signature-based SRI is being spec'd right now: wicg.github.io/signature-ba... This will be useful for many use case and become relevant for PCIv4 compliance which requires assuring the integrity of sourced scripts (6.4.3). Please chime in and share your use cases: github.com/WICG/signatu...
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Lukas Weichselbaum @webappsec.dev · 18/11/2024
Web security starter pack is in good shape now and includes many amazing folks passionate about web security like @terjanq.bsky.social and @shehackspurple.bsky.social: go.bsky.app/Uf8dZhz Please share and recommend folks passionate about web security so we can get this community started here 🙂
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Lukas Weichselbaum @webappsec.dev · 17/11/2024
Read all about how we made web security measurable at Google! Security signals have allowed us to massively scale our web security program and enabled us to deploy security features like CSP or Trusted Types at scale!
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Lukas Weichselbaum @webappsec.dev · 17/11/2024
I'm in the process of creating a *web security* starter pack and need your help finding more webbies here. Please share and recommend folks passionate about web security in comments below so we can get this community started here 🙂 go.bsky.app/Uf8dZhz
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Alex Rebert @ayper.bsky.social · 15/11/2024
Excited to share our latest blog post on memory safety! We’re tackling spatial safety in our massing C++ codebase by hardening live++ by default. It adds bounds checks to things like std::vector, preventing a fair bit of out-of-bounds vulnerabilities: security.googleblog.com/2024/11/retr...
security.googleblog.com
Retrofitting Spatial Safety to hundreds of millions of lines of C++
Posted by Alex Rebert and Max Shavrick, Security Foundations, and Kinuko Yasada, Core Developer Attackers regularly exploit spatial mem...
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Lukas Weichselbaum @webappsec.dev · 16/11/2024
If you're into web security take a look at my LocoMocoSec keynote slides from this summer about "Google's Recipe for Scaling (Web) Security": speakerdeck.com/lweichselbau...
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Lukas Weichselbaum @webappsec.dev · 16/11/2024
If you haven't deleted your Twitter account yet, please signal boost this post so we can get more folks connected over here: x.com/we1x/status/...
x.com
x.com
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Lukas Weichselbaum @webappsec.dev · 16/11/2024
XSS vulnerabilities keeping you up at night? 😱 Google's new "Commitment to Secure by Design" whitepaper has answers! Safe Coding and web platform improvements are key. Read more (page 7): static.googleusercontent.com/media/public...
static.googleusercontent.com
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Lukas Weichselbaum @webappsec.dev · 16/11/2024
Everyone who wants to grow/bootstrap their #infosec network here check out John's amazing starter pack!
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